Fluid tank



FIG. 1 is a front perspective view of a fluid tank according to our new design;

FIG. 2 is a rear perspective view of a fluid tank according to our new design;

FIG. 3 is a top view of the fluid tank of FIG. 1;

FIG. 4 is a bottom view of the fluid tank of FIG. 1;

FIG. 5 is a front view of the fluid tank of FIG. 1;

FIG. 6 is a rear view of the fluid tank of FIG. 1;

FIG. 7 is a side view of the fluid tank taken from the right side of FIG. 1; and,

FIG. 8 is a side view of the fluid tank taken from the left side of FIG. 1.

The broken lines shown in FIGS. 1, 3, and 5 form no part of the claimed design. 

The ornamental design for a fluid tank, as shown and described. 